6y+18+3(y-2)=21

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Solution for 6y+18+3(y-2)=21 equation:


Simplifying
6y + 18 + 3(y + -2) = 21

Reorder the terms:
6y + 18 + 3(-2 + y) = 21
6y + 18 + (-2 * 3 + y * 3) = 21
6y + 18 + (-6 + 3y) = 21

Reorder the terms:
18 + -6 + 6y + 3y = 21

Combine like terms: 18 + -6 = 12
12 + 6y + 3y = 21

Combine like terms: 6y + 3y = 9y
12 + 9y = 21

Solving
12 + 9y = 21

Solving for variable 'y'.

Move all terms containing y to the left, all other terms to the right.

Add '-12' to each side of the equation.
12 + -12 + 9y = 21 + -12

Combine like terms: 12 + -12 = 0
0 + 9y = 21 + -12
9y = 21 + -12

Combine like terms: 21 + -12 = 9
9y = 9

Divide each side by '9'.
y = 1

Simplifying
y = 1

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